<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>事件举例</title>
    <link rel="stylesheet" href="../../css/style.css">
</head>
<body>
<div class="container">
    <input id="username"/><div id="message" class="box2"></div>
</div>
</body>
<script src="js/demo.js"></script>


</html>